Verification Phase makes a perfect opportunity for evaluation of ready-to-use
product quality in its Information System Environment. In other words, the product is integrated (supposedly complete) and should correspond to stakeholder’s functional and non-functional requirements. This explicitly means that External Quality requirements have to be satisfied in this phase. The process of the evaluation of External Quality requires a similar procedure as Internal Quality evaluation and is being similarly well supported by standardization instruments.
The recommended procedure consists of:
• Measurements of External Quality attributes. Document to be used:
ISO/IEC 9126 – Part 2 
• Documentation of measurements. Document to be used: ISO/IEC 14598 –
Part 6 
• Evaluation of the quality of the product. Documents to be used, depending
on the position of the evaluating entity: ISO/IEC 14598 – Part 3: Process
for Developers , Part 4: Process for Acquirers  or Part 5: Process
for Evaluators The results of measurements of External Quality attributes are
compared with target values assigned to them in previous phases. The
resulting conclusions may be feed backed as the corrective measures of
improvement. The feedback may be directed to different phases of the process
depending on the level of the severity of discrepancies between required and
obtained External Quality.
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The business value of the software product results from its ultimate quality seen by both acquirers and end users. An integrated life cycle quality model, further called complement model for software product quality combines high level quality view of TL9000 Handbook and detailed view from ISO/IEC 1926 in the process of defining, measuring, evaluating and finally achieving appropriate quality of usercentered software product.
This paper presents how the use of TL9000 product operational (in-the-field) quality measures can bring benefits to setting up, measuring and evaluating the quality of the software product being developed, through its entire life cycle. The process of building quality into a software product is discussed and illustrated by TL9000-ISO complement model as well as by application process walk-through.